condition mean min max ZT0-3 3.9903874999999998 3.5902849999999997 4.39049 ZT4-7 5.65995 5.65995 5.65995 ZT8-11 5.087535 5.087535 5.087535 ZT12-15 0 0 0 ZT16-19 5.98371 5.98371 5.98371 ZT20-23 4.0618300000000005 4.0618300000000005 4.0618300000000005